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Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ (45) $ (269) $ (320)
Other comprehensive income (loss) 20 18 (50)
Ending balance 46 (45) (269)
Foreign Currency Translation Loss      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (181) (218) (184)
Other comprehensive income (loss) 7 37 (34)
Ending balance (174) (181) (218)
Minimum Pension Liability Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (12) (14) (9)
Other comprehensive income (loss) 1 2 (5)
Ending balance (11) (12) (14)
Deferred Gains (Losses) On Derivative Financial Instruments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (29) (8) 3
Other comprehensive income (loss) 12 (21) (11)
Ending balance (17) (29) (8)
Accumulated Other Comprehensive Loss, net      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (222) (240) (190)
Ending balance $ (202) $ (222) $ (240)